You’ll need:

50ml Shagwells gin
20ml lemon
10ml sugar syrup
10ml elderflower cordial
soda, for topping up

Shake the Shagwells gin with the lemon, sugar and a dash of elderflower cordial. Pour over rock ice and lengthen with the soda. Decorate with a sprig of your favourite herb. If you’re feeling like a true vagabond then top with sparkling wine to make an elderflower royale.